In QED, the gauge transformation which acts upon a fermionic field $\psi$ is
$$\psi'(x)= e^{i \alpha(x) Q}\psi(x)$$
where $Q$ is the charge operator. Most of the time it's just written as
$$\psi'(x)= ...

Right now, all of the "stuff" that has been created in the world is made of protons, electrons, and neutrons. I'm aware that particles other than these have much shorter lifetimes. But I've also heard ...

My question is related to the interpretation of antiparticles. According to the so called Feynman-Stueckelberg interpretation a negative energy solution of the Dirac equation corresponds to a positron ...

We have a project at school to develop an idea about how we can generate electricity.
My question is: do collisions between matter and antimatter particles generate heat, so that one could harvest it ...

A chiral eigenstate is always a linear combination of a particle and an antiparticle state and a particle or antiparticle state is always a linear combination of chiral eigenstates. Now, how can we ...

I've read across several sources that before C. Anderson discovered the positron in 1933 there were evidence of its existence pointed out previously by C.-Y. Chao and D. Skobeltsyn. After some rearch ...

If I have two matter and antimatter particles, say an electron and a positron, each moving towards each other with a certain speed, they annihilate after the collision. Does the energy of the photons ...

For instance if there was a galaxy, assume it to be made up of antimatter (isolated from other "normal" galaxies), how would we, or rather, would we be able to distinguish if it was made up of matter ...

I know that the gravitational interaction of antimatter is expected to be the same as normal matter.
But my question is, has it ever been experimentally validated?
I think it would not be a trivial ...

Their mass is the same. None of them interacts with EM fields. And their decay (around 1000s) is far too slow to see their decay products yet in the detector.
How is it then possible to differentiate ...

I can't seem to find an answer to this. For a given configuration, say for a Hydrogen atom: the proton has properties which give it a positive charge. This is a known truth.
Now lets take Hydrogen's ...

This is a follow-on from previous question:
It seems as though all experiments concerning antimatter have only been conducted with antimatter protons - as they are obtainable through decay.
Have any ...

I would be a little more restrained with the existence of antineutrons. First at all - if I understood right - the existence of antiquarks is hypothetical. If one not agree with this please refer to ...

There is a quote and citation on the "Antimatter" page of the obvious encyclopedic site (https://en.wikipedia.org/wiki/Antimatter), saying that positrons could be produced (in the future) at a rate of ...

Would we be able to tell if an entire neighboring galaxy was made up of anti-matter? What would we see in its signals? It seems like the anti-matter could be stable if it was completely surrounded by ...

Is it possible that matter/antimatter collisions emit resonance frequencies of H/He?
I am researching a high energy phenomenon that occurs between the frequencies of 1200-1580 MHz. This come from a ...

Pretty simple question (I think), probably stemming from my lack of formal background in physics.
I've been reading questions like this one related to attraction with respect to spin (a term I'm not ...